<template>
  <div>
    <h1>当前求和为:{{sum}}</h1>
    <h3>当前求和放大10倍为:{{bigSum}}</h3>
    <h3>我在{{school}},学习{{subject}}</h3>
    <select v-model.number="n">
      <option :value="1">1</option>
      <option :value="2">2</option>
      <option :value="3">3</option>
    </select>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
    <button @click="incrementOdd">当前求和为奇数再加</button>
    <button @click="incrementWait">等一等再加</button>
  </div>
</template>
<script>
import { mapState, mapGetters } from 'vuex';
export default {
  name: 'Count',
  data() {
    return {
      n: 1 //用户选的数字
    };
  },
  mounted() {
    console.log('Count', this);
  },
  computed: {
    //靠程序员自己亲自去写计算属性
    /*he() {
      return this.$store.state.sum;
    },
    xuexiao() {
      return this.$store.state.school;
    },
    xueke() {
      return this.$store.state.subject;
    }*/

    //借助mapState生成计算属性,从state中读取数据.(对象写法)
    //...mapState({ he: 'sum', xuexiao: 'school', xueke: 'subject' })

    //借助mapState生成计算属性,从state中读取数据.(数组写法)
    ...mapState(['sum', 'school', 'subject']),

    /*************************************** */

    /* bigSum() {
      return this.$store.getters.bigSum;
    },*/

    //借助mapGetters生成计算属性,从getters中读取数据.(对象写法)
    //...mapGetters({ bigSum: 'bigSum' }),
    //借助mapGetters生成计算属性,从getters中读取数据.(数组写法)
    ...mapGetters(['bigSum'])
  },
  methods: {
    increment() {
      this.$store.commit('JIA', this.n);
    },
    decrement() {
      this.$store.commit('JIAN', this.n);
    },
    incrementOdd() {
      this.$store.dispatch('jiaOdd', this.n);
    },
    incrementWait() {
      this.$store.dispatch('jiaWait', this.n);
    }
  }
};
</script>
<style lang="less" rel="stylesheet/less" scoped>
</style>